use std::ptr;

mod alloc_testing {
    pub fn alloc_test_get_header(ptr: *mut u8) -> *mut BlockHeader;
    pub fn alloc_test_overwrite(ptr: *mut u8, length: usize, pattern: u8);
    pub fn alloc_test_malloc(bytes: usize) -> *mut u8;
    pub fn alloc_test_free(ptr: *mut u8);
    pub fn alloc_test_realloc(ptr: *mut u8, bytes: usize) -> *mut u8;
    pub fn alloc_test_calloc(nmemb: usize, bytes: usize) -> *mut u8;
    pub fn alloc_test_strdup(string: &str) -> *mut u8;
    pub fn alloc_test_set_limit(alloc_count: isize);
    pub fn alloc_test_get_allocated() -> usize;
}

mod framework {
    // Function declarations from framework.c
}

mod binary_heap {
    use std::cmp::Ordering;

    #[derive(Debug)]
    enum HeapType {
        Min,
        Max,
    }

    struct BlockHeader {
        // Define the structure of BlockHeader as needed
    }

    pub struct BinaryHeap<T: Ord> {
        data: Vec<T>,
        heap_type: HeapType,
    }

    impl<T: Ord> BinaryHeap<T> {
        pub fn new(heap_type: HeapType) -> Self {
            BinaryHeap {
                data: Vec::new(),
                heap_type,
            }
        }

        pub fn insert(&mut self, value: T) {
            self.data.push(value);
            let mut index = self.data.len() - 1;
            while index > 0 {
                let parent_index = (index - 1) / 2;
                if match self.heap_type {
                    HeapType::Min => self.data[index].cmp(&self.data[parent_index]) == Ordering::Less,
                    HeapType::Max => self.data[index].cmp(&self.data[parent_index]) == Ordering::Greater,
                } {
                    self.data.swap(index, parent_index);
                    index = parent_index;
                } else {
                    break;
                }
            }
        }

        pub fn pop(&mut self) -> Option<T> {
            if self.data.is_empty() {
                return None;
            }
            let result = self.data[0].clone();
            let last = self.data.pop().unwrap();
            if !self.data.is_empty() {
                self.data[0] = last;
                let mut index = 0;
                while index < self.data.len() {
                    let left_child_index = 2 * index + 1;
                    let right_child_index = 2 * index + 2;
                    let mut swap_index = index;

                    if left_child_index < self.data.len() && match self.heap_type {
                        HeapType::Min => self.data[left_child_index].cmp(&self.data[swap_index]) == Ordering::Less,
                        HeapType::Max => self.data[left_child_index].cmp(&self.data[swap_index]) == Ordering::Greater,
                    } {
                        swap_index = left_child_index;
                    }

                    if right_child_index < self.data.len() && match self.heap_type {
                        HeapType::Min => self.data[right_child_index].cmp(&self.data[swap_index]) == Ordering::Less,
                        HeapType::Max => self.data[right_child_index].cmp(&self.data[swap_index]) == Ordering::Greater,
                    } {
                        swap_index = right_child_index;
                    }

                    if swap_index != index {
                        self.data.swap(index, swap_index);
                        index = swap_index;
                    } else {
                        break;
                    }
                }
            }
            Some(result)
        }

        pub fn num_entries(&self) -> usize {
            self.data.len()
        }
    }
}

mod tests {
    use super::binary_heap::{BinaryHeap, HeapType};
    use super::alloc_testing;

    const NUM_TEST_VALUES: usize = 100;
    static mut TEST_VALUES: [i32; NUM_TEST_VALUES] = [0; NUM_TEST_VALUES];

    fn test_binary_heap_new_free() {
        let heap = BinaryHeap::<i32>::new(HeapType::Min);
        assert_eq!(heap.num_entries(), 0);

        // Freeing the heap is handled by Rust's memory management
    }

    fn test_binary_heap_insert() {
        let mut heap = BinaryHeap::<i32>::new(HeapType::Min);
        for i in 0..NUM_TEST_VALUES {
            unsafe { TEST_VALUES[i] = i as i32 };
            heap.insert(unsafe { TEST_VALUES[i] });
        }
        assert_eq!(heap.num_entries(), NUM_TEST_VALUES);
    }

    fn test_min_heap() {
        let mut heap = BinaryHeap::<i32>::new(HeapType::Min);
        for i in 0..NUM_TEST_VALUES {
            unsafe { TEST_VALUES[i] = i as i32 };
            heap.insert(unsafe { TEST_VALUES[i] });
        }
        for i in 0..NUM_TEST_VALUES {
            assert_eq!(heap.pop(), Some(i as i32));
        }
    }

    fn test_max_heap() {
        let mut heap = BinaryHeap::<i32>::new(HeapType::Max);
        for i in 0..NUM_TEST_VALUES {
            unsafe { TEST_VALUES[i] = i as i32 };
            heap.insert(unsafe { TEST_VALUES[i] });
        }
        for i in (0..NUM_TEST_VALUES).rev() {
            assert_eq!(heap.pop(), Some(i as i32));
        }
    }

    fn test_out_of_memory() {
        let mut heap = BinaryHeap::<i32>::new(HeapType::Min);
        alloc_testing::alloc_test_set_limit(0);

        for i in 0..16 {
            assert!(heap.insert(i));
        }
        assert_eq!(heap.num_entries(), 16);

        for _ in 0..16 {
            assert!(!heap.insert(0));
            assert_eq!(heap.num_entries(), 16);
        }

        for i in 0..16 {
            assert_eq!(heap.pop(), Some(i));
        }
        assert_eq!(heap.num_entries(), 0);
    }

    fn run_tests(tests: &[fn()]) {
        for test in tests.iter() {
            test();
        }
    }

    pub fn main() -> i32 {
        let tests = [
            test_binary_heap_new_free,
            test_binary_heap_insert,
            test_min_heap,
            test_max_heap,
            test_out_of_memory,
        ];

        run_tests(&tests);

        0
    }
}

fn main() {
    tests::main();
}
